(;
AB[pd][pp][nc][fq][dr][lq]
AW[dp][cn][dd][qf][qi][nq]
C[Black to play in the lower right?

Source:
    1st LG Cup, 1996
    Zhu-jiu Jiang 9P (white) vs. Ryu Shikun 7P
    Commentary:  Zhu-jiu Jiang 9P]
(;
B[np]
C[Both the upper left and the upper right side positions make this attachment inferior for Black.];
W[op]
C[This wedge is the correct response.]
(;
B[oq]
C[Black needs a good ladder to play here.];
W[oo]
C[White is happy to use either ladder.];
B[pq]
C[For example ...];
W[mp]
)
    (;
    B[oo]
    C[Because of the previous variation, Black must atari here from the outside.];
    W[oq]
    C[With the following sequence, White lives and Black makes outside thickness, but ...];
    B[mp];W[pq];B[qp];W[qq];B[rq];W[rr];B[rp];W[mr]
    TR[qi][qf]
    C[... the waiting marked stones reduce the effectiveness of Black's thickness.  This result is perfect for White.  Black cannot play this way.]
    )
)
    (;
    B[oq]
    C[Correct.];
    W[np]
    C[Necessary.  Even though standing up here creates a heavy group, allowing Black to play here would be just too big.];
    B[pn];W[mn]
    C[White continues to run out.];
    B[ip]
    C[With White's weak lower right group, White will have to be careful about invading the lower right corner.]
    )
)

